I am trying to reduce the number of utilitarian email accounts we use and I'm not sure how to configure. I want to set it up so that when a customer emails to group<_at_>domain.com, it goes to everyone in the group. I don't need an email account for this as nothing needs to come back or be replied from the group address. I just need a distribution to group members. Should I be looking at Alias or Group or Distribution List?

You could use any of the three, so It kind of depends on how you envision using them Your brief description makes me think that mailing lists is probably the way to go if someone else will be deciding who the group members are.

The mailing list allows users to add or remove themselves from the list via an email (subject to admin approval if you so desire). In lists where I have a lot of churn, so that I'm adding or removing someone every week, I prefer the mailing list method so that the list owner can be one or more non-admin-someone-else(s). That way the list owner(s) can decide if somebody is allowed on the list or not. Also, list members can remove themselves if they desire. Kerio's implementation of GNU-mailman is pretty rudimentary, so an admin still has to get involved to do most list maintenance tasks such as membership removal and addition if the users can't figure it out themselves. The mailing list does not, however, integrate with Active Directory if you are using Windows AD. You can also restrict a mailing list so that only mailing list members can send messages to the list, although it doesn't sound like you need that feature.

The group and alias approaches require an admin to maintain the lists.

I don't recommend using aliases. While the alias is a quicker set up for one or two person lists, I've found that aliased lists are killed by a lot of spam filters if you are mailing outside your Kerio server, and they quickly become a maintenance headache if you get very many members.

The Groups method is a snap to maintain if you use Active Directory, and is still pretty easy if you don't. It is probably the way to go if you have to be the one who adds and removes members from the group mail lists anyway (if your users can't be bothered, or are just too technophobic to do it themselves, or your groups never change once set up).

Mid 2015: Quit Kerio and moved to Exchange 2013 and Meraki.
Kerio Control 8.4.0--Used since it was WinRoute, many years ago
Kerio Connect 8.4.0 on Ubuntu. Bought Connect just in time for the switch to NO SUPPORT(aka pay for support). Not. Happy.

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